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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd736065cda883b3b32c7432f4a434f74fcc2a6c9f9f2c91b5a63a03e6c74ce' 
  AND token = 'i0vNGyxCXK/8BCG7gSypYqIIjDj6qTqrTW1d1pPRATU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}